At the bottom of this page, you can use checkboxes to add any or all of those sensors to your order easily.

The gas sensor simply plugs into this Gas Sensor Board, making it easy to use the sensor in an embedded project. The board can be connected to a microcontroller system, allowing the sensor to be controlled and monitored automatically. The interface is made through a 4-pin SIP header and requires two I/O pins from the host microcontroller.

The Gas Sensor Board is intended to provide a means of comparing gas sources and being able to set an alarm limit when the source becomes excessive.